Mixing and grinding mill



Nov. 23 1926.

W. H. CHEYNE MIXING AND GRINDING MILL Filed March 20. 1923 2 Sheets-snee*v Nov. 23 ,1926. 4 1,608,200

W. H. CHEYNE MIXING AND GRINDING MILL Filed March 20, 1923 2 sheets-sheet 2 VJILLEAM HARDE? CIEYNE,

EEENTFRLD, ENG-LAND.

Application filed March 20, 15323, eral 11o. and in Great Britain May 1, 1922'.

rlhis invention relates to mixing and grinding mills, and has reference more particularly to such mills constructed for dealing with paint, either in the dry or liquid form.

iin object of the invention is to construct a machine which is eflicient and simple acting in regard both to the mixing and grinding, and especially such apparatus in which the mixing and grinding can be associated in single machine.

Another object is to provide a machine adapted for mixing and grinding simultaneously, so that a continuous operation is obtained, while also the mixing may be prolonged before grindii'ig commences according to the material treated.

' 1n the accompanying drawings are illustrated preferred constructions embodying the present invention:

Fig. 1 is a sectional elevation;

Fig. 2 is a transverse view on the line 2 2 of Fig. 1 of a construction employing a single propelling means;

Fig. 3 is a detail hereafter referred to; and I Fig. 4t shows a. construction embodying superposed propelling means.

Referring" to the drawings, the container 1 is shown Carried on supports2, the container having an opening 3 at the top and an inclined concave bottom portion d of conoidal form, which slopes downwardly towards the discharge or delivery end of the container. rlilhe propelling means of the mixer is constituted by spiral strips '5 of metal, each wound in a gradually increasing diameter corresponding to the slope of the bottom portion d of the container, the strips are of coarse pitch and being carried by short arms (5, fixed to an approximately horizontal hollow shaft 7 supported in bearings 8, 9, at each end of the container, the shaft 7 carrying a driving wheel 10 geared to any suitable motive power to ell'ect rotation of the strips or vanes 5, the material in the container 1 being thereby lifted from all along the bottom face and at the same time vpushed towards -the lower end of the container, which combined action results in the material being very well mixed.` 1t will, however, be noted that due to the inclined bottom of the container there is a tendency for the material to flow t the lower end.` '"fhis flow is augmentedby the liow caused by the propelling means, and the is that the two forces acting together, is, the force of the propelling` mixer vrfistituted by the strips 5, and the force rarity, cause a, piling up of the material he lower end, and this material falls back inte the container' so that a still furtl er mixing occurs. The end wall 11 at the delivery end of the container is ported as clearly indicated in lig. 2 by the reference 12, through which port the mixed material is pushed by the aid of enlargements EL on the feed ends of the propelling means when the latter is operated. To control the flow through the powts 12, a ported plate 13 may be fitted ag nst the end wall 11, which plate is adapted for angular adjustment thereagainst by reason of a handle 14 fitted to an extension of the container 15 incorporated with the plate 13.

By operating the handle 14, the ports 12 can be more or less closed by adjusting the register therewith of the ports in the plate rlhe extension 15 is outwardly flared, as indicated at 1S, to form the fixed grinding face of a grinder', a rotatable member carrying a grinding face 17 being fitted thereagainst and driven from the shaft 18 so that the material exuded from the container 1 after being thoroughly mixed, may be subjected to a grinding operation between the said faces 1G and 1'? before it is discharged to the hopper 19. The conveyance of the mi2-:ed material to the grinding faces 16, 17 is due in part to the fact that the extension includes a continuation of the inclined bottom et so that there is a tendency for the material to flow to the grinding faces from the container. This, of course, is also augmented by the pressure from the propelling mixer, comprising the vanes 5. The shaft 1S bearings within the shaft 7 of the propelling means and carries a driving wheel 2O driven in similar manner to the wheel 10 aforesaid. ln order to adjust the position of the grinding face 17 relatively to the grinding face 16, an adjusting screw 21 with a locking wheel 22 is provided which, on operation, relatively moves the grinding face 17 on its shaft 18.

ln the case of foreign particles arriving between the grinding faces and thereby damaging the parts, a removable distance piece 23 i. interposed between a thrust block tf o other abutnent, on the endV of the of the rotatable member is supported inV work, such as which provides an end support for the shaft 18, so that removal of the distance piece 23 by tilting it about its hinge anis 25, clearly indicated in Fig. 3, permits a longitudinal movement of the shaft 18 until the thrust block 24 abuts against the end frame 25, thereby giving a corresponding clearance between the parts 16 and 17 for removal Vof the foreign body, whercon the parts can be returned to normal position with the distance piece Q3 be tween the parts 24 and 25, that is, there is a definite return to initial position before Separation. .lt should be noted that the shaft 18 is supported within the. shaft 7, so that for the greater part of their length there is a chamber Q7, which may be utilized as a container for lubricant, the circulation of which can be assured in any well known manner.

Instead of utilizing a grinder having two facesysuch as 16 and 17, the grinder may comprise two sets of grinding faces, and in this construction insteadV of making the ezttension 15 integral with the plate 13, it is separate therefrom, a controlling handle. 28 being directly attached to the plate 13.

1n order to provide the second grinding face the extension 15 is provided with lugs 29, preferably three in number, tapped to receive bolts 30 utilized to fis: a spider 31 bearing on a disc 32 carrying a grinding face 34 which is spaced from the grinding face 1G. rlhe rotatable member of the grinder fitted to the shaft 18 in this construction is shown interposed between the two fixed grinding faces 16 and 32 and is indicated by the reference 33, and as shown, comprises two grinding faces, one opposed 'to the face 16 of the extension 15, and the other to the face 34 of the fixed disc Adjustment of the bolts 30 will initially regulate the pressure between the grinding faces on the rotatable member 3S and the two grinding faces 34 and 16, while-a final adjustment is permitted byvmeans of a lthreaded stud 35 carried by the spider 31 and bearing on the central boss of the disc The extension 15 may be provided with an internal chamber' 36 adjacent the grinding face 16 and the disc 32 may have a hollow interior 37, so that a heat transfer medium may be introduced adjacent the grinding faces to heat or cool them as circumstances require.

A grinder comprising two elements, such as 15 and 17, or a grinder element comprising two sets of faces as shown in Fig. 4, may be associated with a single propelling means as described with reference to Fig. 1, or either type of grinder may be associated with superposed propelling elements, as indicated in Fig. 4, in which case it .is`preferred to separate the superposed elements by a partition 38, ported at each end as indicated at 39 and 40, to per uit flow of mata rial being mixed from one propelling means to the other, i. e., from one side of the partition to the other, the` propelling means bcing connected by gear, suoli as 41, so that they rotateat equal speeds.

The rest ofthe construction shown in Fig. 4 is similar to that shown in Fig. 1, like parts being indicated by similar reference numerals. i

ln either construction the container may be provided with a jacket 42 for the reception ofa heat transfer medium, and the jacket may be either cast on the container, or the container be. provided with annular ribs, Asuch as 43, which are faced and tapped so that a suitable sheet of material, such as 44, may be fitted thereto, as indicated in Fig. 4.

Very excellent results are obtainable by a. machine made according to this invention and that without any skilled' attention, and the invention may even be used for dealing with dry powders which are known to be more difficult of admiirture than wet materials, especially when dealing with paint ingredients. Further, the trough Vcan becompletely emptied by simply continuing the rotation of the propelling means.

`By useof a ported plate such as 13, the mixer can be isolated `from the grinder for separate use so thatmaterial may be subjected to the mixing operation for any predetermined time beforeit is passed on to the grinder, and in such case the `material will Vbe forced to taire a circular path in the container by reason `of the action of the propelling means in combination with the inclined bottom portion.

The grinding faces may be constructed from marble or materials other than metal,

land either the grinding` chamber, or the trough may be lined with enamel.

I claim:

l. A paint mixing machine comprising in combination a container for the material to be treated, an inclined concave interior bottom face to said container, and a mixer in the form of propelling means arranged on a horizontal shaft, including spiral strip members of coarse pitch spaced from the shaft, extending over the length of the bot tom face adapted to lift material towards the lower end thereof, thereby augmenting the tendency of Ithe material to flow to said lower end due to the incline of saidbottom face., a discharge opening in said end wall, an enlargement on the :feed end of the propelling mix-er adapted to push mixed material through said discharge opening when the propelling mixer is operated and means for closing said opening during mixing, the end wall at the lower end of the container extending vertically above the mixer so as to provide 'further space in which thematerial may pile up at the lower end of the container under the combined forces of the propelling` mixer and gravity, whereby lurther mixing, due to back falling of the piled np material in the container obtains.

2. A paint mixing machine comprising in combination a container for the material to be treated, an inclined concave interior bottoni tace to said container, and a mixer in the form of propelling means arranged on a horizontal shaft, including spiral strip members of coarse pitch spaced from the shaft, exten-ding over the length ot the bottom face adapted to lift material from all along the bottom `lace and push the material towards the lower end thereof, thereby auginenting the tendency of the material to flow to said lower end due to the incline of said bottom face, a discharge opening in said end wall, an enlargementl on the feed end of the propelling mixer adapted to push mixed material through said discharge opening when the propelling mixer is operated and means for closing said opening during miX- ing, the end wall at the lower end of the container extending vertically above the mixer so as to provide further space in which the material may pile up at the lower end of the container under the combined torces of the propelling mixer and gravity, whereby 'fuit-her mixing, due to back falling of the piled up material, obtains, an eX- tension of the container on said end wall including a continuation of the inclined bottom tace of the container, and a grinding tace on said continuation and a compleinentary rotatable grinding face, the continuation of the bottom face of the container vfunctioning as a means of conveying the WILLIAM HARDIE CHEYNE. 

